I have started this section on my Udemy course which will teach you about MQTT Client implementation on the W5500 + STM32 Platform. We will use the Eclipse Paho client library for our projects, it is a free and open source MQTT Client that can be easily ported to any embedded platform. I will teach you everything about the Paho library and its working and porting details. All with working example codes!
https://www.udemy.com/course/ethernet...